Sayyiduna Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever hears a word of wisdom and does not attribute it to the one who said it, but only narrates what he has heard of evil, his example is like that of a man who came to a shepherd and said: O shepherd! Give me a goat that is fit for sacrifice. The shepherd said: Go and grab the ear of the best goat (and take it). But he went and grabbed the ear of the shepherd's dog and took it away."